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UARS WEEKLY STATUS REPORT - 28 Feb 2003
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SOLSTICE
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Nothing received.
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SUSIM
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SUSIM successfully gathered all of its daily mid resolution,
weekly offset, and occultation scans during periods of
UARS telemetry.
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ACRIM
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Nothing received.
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PEM
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Nothing received.
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HALOE
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For the past several months the HALOE Project experienced
operational processing failures on occasional scans. The
problem has been traced to data packets arriving at PACOR-A out-of-order,
causing discontinuities in the times associated with the data
stream. The data transmission problem seems to have been fixed.
We have been able to process that last 21 days of HALOE data
with only one failure. We continue to work on the source of remaining
failures. Thanks to those persons at PACOR-A and the UARS
Project for looking into the problem.
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MLS
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Nothing received.
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HRDI
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Nothing received.
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WINDII
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Nothing received.
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MPG
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The MPG continues to serve as the point-of-contact for UARS
instrument operations in support of the Science Traceability
Mission of UARS.
The DECNET communications circuit between the UARS
Command Management System (CMS) and the Remote Analysis
Computers (RACS) was restored to service on 21 February
2003. Normal processing of instrument Daily Activity
Plans resumed this week and continues with no problems.
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CDHF
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Nothing recieved.
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FOT
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REPORTING PERIOD
This report covers 15 February 2003 (Orbit 62518, GMT Day 046) through
21 February 2003 (Orbit 62623, GMT Day 052).
SPACECRAFT OPERATION
The observatory is now in Forward Flight (Southern Hemisphere viewing)
and is performing nominally under two-battery operations. The
instrument operational changes were:
INSTRUMENT OPERATIONAL CHANGES
Instrument Time Orbit Comment
PEM 046/1256 62526 AXIS POWER ON
The beta angle ranged between the angles of 42.3 degrees to 29.7
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 01 March 2003 (DOY 060).
Spacecraft battery 1, 2, and 3 performance monitoring continues.
Battery 1 remains OFF the charge relay. Battery 2 and Battery 3 are
currently maintaining greater than 23.6 V end-of-night (EON) load bus
voltage. Battery temperatures are stable with a temperature delta
between Battery 2 and Battery 3 of 1.28 to 1.29 degrees C. Additional
battery performance data for each battery on 14 February and 21
February 2003 are provided in Appendix D.
The clock error ranged from -10.0 to 9.1 msec during this report
period. Clock rate adjustments are listed in Appendix C.
All instrument and subsystem engineers were advised on the initial
excursion of ALERTS or Out-Of-Limits conditions detected by the FOT
for this report. A summary is listed below and the details of ALERT
and Out-Of-Limits occurrences are listed in Appendix B.
OUT-OF-LIMITS = 00
ALERTS = 00
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
FOT = 01
PEM = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 03
Four (4) Anomaly Report remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
Three (3) operational support problems occurred this period. Anomaly
Reports are included in Appendix E.
The data loss calculations are no longer being supplied by Data
Capture Facility (DCF).
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
During the re-investigation of the OBC Halt Anomaly the FOT found that
during the anomalous pass, the HRDI load was sent with 30 additional
commands pre-pended to the load. A bit bust of these commands showed
that one of these commands was a Select Fixed Bank 13 command, which
immediately brought the OBC offline. These commands were generated by
Eclipse due to a bug in the "cmdprt.exe" code. The bug has been fixed
and a patch was tested and installed on the operational systems on 11
February 2003. The FOT is now in the process of revising the Anomaly
Investigation Report.
MEETINGS
-None this report period
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 01 March 2003 (DOY 060). This
maneuver will be a Forward to Reverse Flight maneuver (Northern
Hemisphere viewing).
Attachments: Appendix A, Real-time Command Sheets
Appendix B, Out-Of-Limits & ALERT Occurrences
Appendix C, Clock & Solar Array Rate Corrections
Appendix D, UARS Battery Performance Data
Appendix E, UARS Anomaly Reports
APPENDIX A
REAL-TIME COMMAND SHEETS
Week ending 21 February 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
62526 046/1256 03-041 PEM AXIS POWER ON
62531 046/2122 03-042 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 21 February 2003
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
-------- ----- ----------- ------
-None this report period.
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
-------- ----------- ------
-None this report period.
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 21 February 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
62531 046/2147 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 21 February 2003
14 February 2003 - GMT Day 045 Beta = 43.1 deg, SA Pos = 269 deg
DIFF V (mV) TEMP (C) CURR (amp) EON V AVE C/D AVE
BAT MAX/MIN MAX/MIN MAX/MIN MIN RATIO DOD(%)
--- ------- -------- ---------- ----- ------- ------
1 -168.0/-190.4 -3.05/-4.31 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-39.2 +5.47/+3.87 +26.8/-15.2 25.8 1.020 20.4
3 +22.4/-33.6 +4.51/+2.92 +25.6/-14.8 25.8 1.020 20.2
21 February 2003 - GMT Day 052 Beta = 29.7 deg, SA Pos = 269 deg
DIFF V (mV) TEMP (C) CURR (amp) EON V AVE C/D AVE
BAT MAX/MIN MAX/MIN MAX/MIN MIN RATIO DOD(%)
--- ------- -------- ---------- ----- ------- ------
1 -168.0/-190.4 -3.05/-3.99 +00.0/+00.0 08.3 0.000 0.0
2 +44.8/-22.4 +6.44/+5.15 +28.8/-15.2 23.8 1.040 22.5
3 +22.4/-67.2 +5.47/+4.19 +28.4/-15.6 23.7 1.030 22.0
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 21 February 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-005 FOT 62559 048/1757 32330 CDS Equipment problem
03-004 FOT 62559 051/0916 30832 Generic Late Acquisition
03-004 FOT 62601 051/1208 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-004 FOT 62393 037/1640 30832 Generic Late Acquisition
ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-060 FOT 61421 338/0057 N/A PSU Cmd Clock Timeout
03-005 FOT 62559 048/1757 32330 CDS Equipment problem
03-004 FOT 62559 051/0916 30832 Generic Late Acquisition
03-004 FOT 62601 051/1208 30832 Generic Late Acquisition